Logging system



F. R. PENDLETON (LOGGING SYSTEM Filed May 9. 1924' 2 Sheets-Sheet -1 INVENTOR FRANK R, PENDLEZN 5 Y 4/ ygiw A ATTORNEYS tab.- 24. 1925. 1,527,489

F. R. PENDLETON LOGGING SYSTEM Filed May 9, 1924 2 Sheets-Sheet b lNVENTOR FIQANK R. PENDLETON g/ MALZ ATTCR N E Y5 Patented Feb. 24, 1925.

' FRANK R;- IPENDLETON; 0F VANCOUVER; BRITISH COLUMBIA, CANADA.

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Applieation filedw May a, 1924. Serial No. 712,123..

To. all whom it may. concern:

Be it known that.I',.FnAN1cR. PENoLEroN, a citizen of the United States of America, and a. resident. of the, city. of. Vancouver; in the Province. of British. Columbia, Canada, have invented. certain. new and useful Improvements in Logging Systems, of. which the following is a. specification.

My invention relates, to improvements in logging systems the: objects of, whichare first to provide means permitting a heavy load to be. easily rmrin suspension from. one stretch of a continuous. overhead supporting cable or sky. line,pto another, afurtherobject is to provide means. whereby the load is carried? at a substantially even. height-irrespective of the catenary of the supportingrcable or the inclines immediately adjoining the connection between one stretch and another,

anda further obj ect. is to provide a. practical means of hauling a: heavy load from. one stretch ofasupporting cable to another with a mininnun efiort.

The invention consists. essentially of a pair of carriages movable upona supporting cable which carriages are connected: together by a. flexible; member and beneath which the load is suspenderhand means for keeping the pair of carriages apart, as will be more particularly described; in the following specification in which Fig. 1 is a general view of my invention showing theuse on a stationary supporting cable. I

Fig. 2 is a general view of my invention showing its use on a. travelling cable.

Fig; 3. is: av view similar to Fig. 1,. but showing the power plant and operating cables.

In the drawings like characters of refen ence indicate corresponding parts in each figure.

The numeral 1 (Fig. 1) indicates a supporting cable carried at an, intermediate point by a hanger 2 suspended from the head of a vertical support 3, the stretches of the cable 1 leading from opposite sides of the hanger being respectively indicated by the numerals 4 and 5. The numerals 6 and 7 indicate a pair of carriages each being provided with a sheave 8 by which the carriages ride upon the supporting cable 1, the lower portion of each carriage is provided with a connecting pin 9 by which the ends of a flexible member 10 are secured. A load carriage 11 provlded with a pair of upper sheaves 12 and. a pair otlower sheaves 13 (shown. dotted). is mounted for endwise movement on its sheaves. 12 along the flexiblemember 10. Thenumeral 14 indicates a hauling line connected at one end-to the drum let ofthe power plant A and at the other end to the connecting pin 9. of the carriage 6., one end of the. haul back line 15. is attachedto the connecting pin 9 of the carriage 7 its oppo site end being passed around a sheave (not shown) adjacent the outer end of the supporting cable 1 and brought back and connected to a haul back-drum 15 of the power plant.

The. numeral 16 indicates a load line which is secured at; one. end, adjacent the V outer end of the supportingcable, the oppo- Site, end being connected to a further drum 16 of the power; plant,, an intermediate loop 17. of the :load, line being passed down between the lower sheaves 13 of the load carriage. 11in the bight of. which a fall block 18 is. carried.

The numeral 19 indicates. a tag lineattached at, one end tojthe fall block 18 and at the opposite end tov a winding drum 19 for the purpose of drawing the fall block downto. a convenient reach when desired to attach a load. The numeral 20. indicates a. log forming the load to. be transferred lengthwise of the supportingcable. 1.

In the modification shown in Fig. 2 the supporting line 21 is carried over intermcdiate supports 22 upon sheaves 2.3 and is So connected to a power plant that it is drawn in. either direction under sufficient. tension to preventunduc sag on the line when carrying its load, and hangers 24 and 25 are secured. thereto at a suitable distance, apart, the lower extremities of the hangers 241 and .25: are interconnected by a flexible member 26 upon which a load carriage 27 similar in all respects to the carriage 11 is supported. Opposite ends of the load line 28 arecoir nected to drums of the source of power and in the loop 29 depending from the carriage 27 a fall block 30 is carried for suspending the load 31.

Having thus described the several parts of my invention I will now explain its op eration.

Assuming the load to be lying beneath the stretch 4 of the supporting cable 1 and that it is desired to convey it beyond the hanger 2 to the stretch 5 of the cable 1. The load 20 is attached to the fall block 18 and the load line 16 hauled in upon its drum until it is raised a suitable height above the ground, the hauling line 14 is then wound upon its drum while a braking efiect is exerted upon the haul back line 15 until the carriages 6 and 7 are spaced a suitable distance apart to cradle the load carriage 11 upon the flexible member 10 in the manner shown, the drums to which the hauling line 14: and the haul back line 15 are secured are then preferably coupled and run in unison so as to maintain a constant separation between the carriages 6 and 7. As the carriage 6 approaches the hanger 2 and is drawn up the incline of the stretch at the load carriage gravitates along the flexible member 10 towards the hanger 7 and as the carriage 6 descends beyond the hanger 2 upon the stretch 5 and the carriage rises on the stretch 4 to the hanger the load carriage will gravitate towards the carriage 6, as is indicated in the position shown in dotted lines.

The load during this movement is maintained at a constant distance below the load carriage 11 and at an approximate mean dis tance below the supporting cable 1 by the variation of the angles formed by the stretches 4 and 5 of the cable 1 adjacent the hanger and the flexible member 10 between the carriages 6 and 7 A similar eflect is obtained when the supporting cable is endwise movable as shown in Fig. 2, as the load carriage 27 is free to move along the flexiblemember 26 towards whichever one of the hangers 25 or 25 is lower.

It will be noted that since one carriage 6 or 7 rises upon the supporting cable 1 and the load carriage moves towards the other or lower carriage that a minimum of power is required to move the load carriage and its load past the apex of the supporting cable at the hanger 2.

hat I claim as my invention is:

1. In a logging system, the combination of a supporting cable, a carriage transporting member suspended at its ends from said cable and adapted to be moved in the direction of its length, and a load carriage freely supported by said member and adapted to gravitate downwardly thereon so as to remain at an approximately constant elevation irrespective of sagging or inclination of said member during operation thereof.

2. In a logging system, the combination of a supporting cable, a flexible member suspended at its ends from said cable, a load carriage supported to travel freely on said member between the supended ends thereof whereby said load carriage ispermitted to gravitate downwardly when either end of said member is raised with respect to the other, and means for moving said member in the direction of its length to efliect transportation of the carriage.

3. Ina logging system, the combination with a supporting cable, of a pair of carriages spaced apart and movable along the supporting cable, a flexible member connecting one carriage to the other and a load carriage movable lengthwise of the member.

4. In a logging system, the combination with a supporting cable, of a pair of carriages mounted upon the supporting cable, a flexible member connecting the carriages together, a load carriage movable lengthwise of the flexible member, and means for maintaining the pair of carriages at an appreciable distance apart and for tensioning the flexible member.

5. In a logging system, the combination with a supporting cable, of a pair of carriages, a flexible member connecting the carriages together, a load carriage movable lengthwise of the flexible member, and means for tensioning the flexible member to support the load carriage and for moving the pair of carriages along the supporting cable.

6. In a logging system of the type including a carriage transporting cable which is adapted to be moved past a series of supports and is subject to sagging 0r inclination intermediate said supports, the provision of means enabling the load carriage to have a limited movement relative to said cable whereby said carriage is caused by gravity to remain at an approximately constant elevation during transportation and irrespective of inclination of said-cable at its points of support.

Dated at Everett, ash, U. S. A., this 2 day of April, 1924.

FRANK R. PENDLETON.

\Vitnesses C. A. NORWAY, F. J. DOMBEK. 

